I agree with you Ed and I too remember previews. I guess I am showing my age as well!

When
one goes to a movie theater, previews are shown depicting samples of
upcoming movies. (You can tell I'm old. We called them
previews, younger folks call them trailers.)

The thought
is this: What we are seeing are not the opening of seals. We are
seeing previews of things to come. These are the warnings in the
form of a small sample of what is actully going to happen, on a massive
scale, once those seals begin to open and the viles are poured and the
trumpets blow. Just a pinch of what is to come.

So
we can say to the non-believer...all of these things you're
seeing...imagine them on a vast scale. Not deadbirds in a few
locations, but everywhere. Same with the fish, the cattle, and
the creepy crawlies. The floods you're now seeing? Nothing
compared to what is to come. And the earthquakes, and all of the
other manifestations which are now being shown on a very small scale,
comparitively speaking, to the disasters to come once Jesus removes the
believers from the earth.